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AAT3532 Datasheet(PDF) 5 Page - Advanced Analog Technology, Inc.

Part No. AAT3532
Description  MicroPower™ Microprocessor Reset Circuit
Download  8 Pages
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Maker  AAT [Advanced Analog Technology, Inc.]
Homepage  http://www.aatech.com.tw
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AAT3532 Datasheet(HTML) 5 Page - Advanced Analog Technology, Inc.

   
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AAT3532
MicroPower™ Microprocessor Reset Circuit
3532.2005.12.1.2
5
Applications Information
Power Monitor
The reset function monitors the V
CC supply to ensure
a microprocessor is correctly reset and is powered
up into a known condition following a power supply
failure. RST and RST will remain valid for V
CC volt-
ages down to 1.4V.
The RST and RST pins are asserted whenever V
CC
drops below the reset threshold voltage. This volt-
age can be set by programming the TOL pin.
Connecting TOL to V
CC sets the 10% tolerance of
the V
CC supply (typically 4.37V for VCC = 5V).
Connecting TOL to GND sets the 5% tolerance of
the V
CC supply (typically 4.62V for VCC = 5V). The
reset pin is guaranteed to remain asserted for a
minimum period of 250ms after V
CC has risen
above the reset threshold voltage. (See Figure 1.)
RST output is an open drain output. For correct
operation, a pull-up resistor of 10k
Ω should be con-
nected between this output and V
CC.
Functional Block Diagram
Watchdog
Timer
Detector
De-Bounce
Circuit
Watchdog
Timer
Reset
Generator
VCC
Tolerance
Select
VCC
TOL
TD
ST
PBRST
GND
RST
RST
VREF
Figure 1: Reset Output Delay.
VCC
tRPU
tRPD
RST
RST
+5V
+4.75V (5% Trip Point)
+4.50V (10% Trip Point)
RESET Output Delay (VCC Falling)
RESET Output Delay (VCC Rising)
0V


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